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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4700729c7ab514ede838eb072ee262391582f99d486eef29611cc79605c503f' 
  AND token = 'UUzKy2CkgPUP/K1ebsM9GxOHs7halZszqR2zfNyqgu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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