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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f080ef5628e50b65abdcc083737371ea1eb01d19e5618cb1f0d1d8267fe53f' 
  AND token = '81GcC4ojtmCN6gt0EUcsF8rtXBLEqTEVaEs8v7e60lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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