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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f0b0e43c1dc85035f4ecb7716ad44f4bf1cadfc07ffa419eabc5cafb1ab92c' 
  AND token = 'TgAzL5Two3lwkCA2rxX4vuzCbvs7URWFNlvGn/ejj0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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