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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c024f21cb943129d1f24e52e44ab23be03232d70f0d6658102b86f43ee3470' 
  AND token = '88MNLyL6SjMTy4KKgIj3GBcFGTDPzl6E2/cJFnC0oL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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