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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c0695af62cdb8f25086f140e9a31ab1eb2264df271624d1ccdd56857031431' 
  AND token = 'UzxJ3aRmwgsW/3RB/owmtuqWfuUvW0SO7dh9o17Ix2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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