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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a74607ae82617350ee9a36becf66fe58158a9f9e8f4964b8c62969b3b3ba41' 
  AND token = 'N8Oy/ZhaQ69SlGk6MCKL/O7uD6HC63NbOU9V0fhP1IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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