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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f222dace5fe7c935265a8cca00ca12ec487a8dd4bd375a2d7a9c4ac9cfb0be4e' 
  AND token = 'mKoqv3cSCbUfVxiXLXhAb3BbNQt1Bd3846j6Jm46yoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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