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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4051bde452ba177edfb5a2126a4faa6b7ce82b1859680b1d3573b815c3c470b' 
  AND token = 'm50/R+mMLpz3TSwtFnLLSlFJHf+iyIRiKK8naPXLutc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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