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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae1719e08cbe9a5b4e05bcd6373053e9e3bb32fcb57e581e25d6a60c14688df' 
  AND token = '719bvj3fBOpllmuXNFAScI3DwyUTeq1hhN6UH6v0Th4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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