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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a7c0e8dff7fefd0cfee87d0e7291af8c71ff565edca4fb9f29aef7840aeb46' 
  AND token = 'CZEZ3j4ob0aeisy/cke+i0+2eFJ/x8nH9mlASzNmOiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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