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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19ecb8249c7471ab7e176f67d5f1c31df3eb59547fd45c02f6c93e6f396384c' 
  AND token = '8UV7XwtA81Ex7ZPCr968gB9S997pkdfAEf+ck/Mphf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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