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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee485984d7ddb42d60459039c81956ad04f3b19e7a7111727619dad53d4ecab' 
  AND token = '1l26OFX4etCK5dmRN63p5UfVzeBhYEsZ0ZZkVLYtm94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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