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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6416e4f8ddcb74ac1b13bb90938761c94123a1fa62e85284f537655346f51570' 
  AND token = '5d251tD+gMcpHXkuEn39XURdfYnypZpZTSO6Jg+6IqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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