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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a27c99f0b2600d3e8dbcf82ff1b7e52d29e50cd70477c8bfd5d13bb33cf9b9ee' 
  AND token = 'VQ32KIiLEeE05QnVZb2LfiH7ouSrI0Pta4vddh/pwsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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