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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6b6dc6b0b02fe0b57f8ca3f495484f5865ba4b03d127e9cb04d633efe0ae695' 
  AND token = 'yOqu2cAb0A6N1U7d06qB/2JclHMTR68ex39o8RvQ0AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}