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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352655c5c7c4efdadb287d5133c3d57e1ac84fefe881d06f4cc0ebd5365b1ab6' 
  AND token = 'OZ0YajZ2tNDLSEfJXu5npbAkA1g45ids8KL0cWbl1sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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