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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0edaeabd3d10237c85bc7172194a9c8608b0d8ff4678ccfe2161461a7f1c1733' 
  AND token = '7MS6wfLQ8X2rRN70lr2lq3FWg++QGH6ke5z6xACqsUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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