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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777cbc8affd6db3c0e24d27702787dc5acd039b3841422b2da494860f28953d1' 
  AND token = 'pflDbG4SZ+BGx6cGx3f5xzlpeDF1VUi4gB2lvuXXhtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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