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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b896ce951188d9edcd0b5967833be14804f62f5f317de38cd3e051310c6dda02' 
  AND token = 'fJn8AdyMWuSTGlG+/Np79l4vWbNhaufCGzr4ATs8oZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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