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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c968654c50c79b56b3b7a346194082c8c9dc051358584dea075255d0220ed7ca' 
  AND token = 'ta8dzLDXOkoytxLQK3HPLPqYBXcKY8DBy7AzTMikSZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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