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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f12f98ad7ab3287f68260481a75a64a76bbe5ea65436548460d37611e1907c' 
  AND token = 'oyAoL4T+aQ8neATpgifRakHIFMhz0v/X1owMXgeZA0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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