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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66711734b940ba48301dc9cc7abb7202758701321e0ff08eba7144c1062d0e77' 
  AND token = 'gQ90UI8YdS9Nr+6/mktQX+W5nx83VR/z0L5hq+XEUBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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