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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b6c1725497658dc992585d1b898fc3e7e1558f9a27a5e98010ae3d2d3a95e3' 
  AND token = 'llvizwGkprS1TflTeV1xHGxmKPTNWVQZxK7E8i3VPRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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