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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842a85bd3d3ce5594af4327074117d1cc5774d242a9ef50fd8241aab7938d3e2' 
  AND token = '/dR2YV1fZwlQ9QzmOWUOO2wpD7g8aRvL+oP7It7eR+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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