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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131038005c94c95acd032023e550b61d3fd02450c65b345e6694c494db791441' 
  AND token = 'G2T6HWelD1eVQXjXNH8nOk+jxplIpFTPaZJZVJyicHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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