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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12e0d7d3d7858ba94723d5eb90600c1eb475c5edcb257bf4cdfe8fae8f3eaa55' 
  AND token = 'p3SPZ2VJOCHDnIfy1loDXKTKvyyqgXrp+l/edMwq4N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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