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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970a0ff7ad75e5e3731741e03ad7ee65436d418de9a6c6fa6e23bce46960eba5' 
  AND token = '3E1x6g6odBf4xSqnw/SytAc/HAURgaYjbLq0idE5sSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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