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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948d31061a8da4619c98ed7131c63a2455028806d55d3a600208de04d1044be4' 
  AND token = 'pVkbTzOfn0+8gb74v+eXY6ksK/JTcNvYtodHnjIUgRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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