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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a725c62657de2baf1624299e8023dfbb16eebc6f0d826bc9b608eb6ea7c6be9b' 
  AND token = 'cVIUx8OIogl//uXMo+byc2LoP3ihBblw+thoNP3Hx0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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