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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fdb9eae707ef71c6734ee0b3dcfd2b11e4751a1d1698b1485c1dca94bc9c98f' 
  AND token = 'cas/sVyQlY+32FhQhinfQID+Xr3BYiezzIs+fo8uVP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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