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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80f3d2aa7addc3828bbadeca7171984e1d5a35f2b86819ef86cb8715560ec472' 
  AND token = 'DrMlc9No0Hcg+/7DL1WvTnegfVpmIIhxfDv1tyu4xn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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