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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27058b67239778577c0ef1551fac1d710d80d833ac3076c9fc019146ab9d9e32' 
  AND token = 'aB2iOICacr51HCc7JMKGMMWtaln+Qu/SUZQMTuBsYR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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