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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19eac42ccad11da1f6e8de46f72d3ca7290e8d30bf35bbed3c2578d8b3ea7808' 
  AND token = 'eKTLmbl1k/HR9tczejNI/SV130aDw5yxa4/hZ2q8d2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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