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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07216f717d4981fc0e88a40fa41a7a333ab48fcca5320aa96a7b4c0074714f7' 
  AND token = 'eKmrXelI4sXUuh1Dh46Zkzsadb15bHYYKU6tLmpY2mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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