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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8af563930b5f30f6aa7a85eed8243201cc16155a8d33fdc217ba467908a1630' 
  AND token = 'H4okLudO1AZMfMofzXleD8JRYX9r0/LjGovstGHFV/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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