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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53b4d6f4f6090d308a168e2d41dc73d6b207b614964fccd26db97b060ad2f372' 
  AND token = 'o5sezf6gmxFcmdc0ZqDlobpdlk74+uTc39Ww2SqD9h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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