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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f5c0b65fb706c2b0c6760f1642835db3b8fe0950b3a7a32ffc36fc7fe0eb46d' 
  AND token = 'Nd0vVwk9EVIsbj3A4QOcXuYoZiRTPR/Q2f6V2wVP+f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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