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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41dbbe14d82fc39ad2ad34fb03c8ea9b3e4e4efbeffbe52767c4e0aaad42764e' 
  AND token = 'Pcp9h+J3FaOThs3T7tC/Kx0QHSHPLGhf/2C7noTnX98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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