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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa43665e96a0a4dc0bf8ab7feb6a0e1b73c9fa84196c7b43972b8212a1012a6' 
  AND token = '078nSH7BUlo8SakwNeDCfPljlIkHxOQ6LOb74p5W8so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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