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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef25c3c7ea4f3d2a2505b82b12883c6c71cc5080947a582636d3cfbd33455c70' 
  AND token = 'wvJJUF5XptNax9tePLArCly8Qnd7BboImfjh0kSAHqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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