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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe9fcf924766ba18a6042532e214b09030ea6828494099a460e716f9c735990' 
  AND token = 'yhIxFaVgVVbuk0Pkgme2p/cgolNJhr+65aErUiDyVAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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