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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22f11c89d7685a02ed022421e2c20a92b5d2ca67558fb40a5bff1350aba76966' 
  AND token = 'MGh+tE53tZI44hI1TUz2I4CKIHutfGajd1O7y9Bpz1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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