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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65930a3c5d16c70fd85ef94ce671702f381c6ea311629f3b271f9ff06ee41701' 
  AND token = 'YMQUOB8pCkEIRZqDM+EnJ9dox/j8fHexF5r4zgRPIJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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