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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59633b4bd30e31c282131137129aca33a2debb8b0f17bc37feeaf91807638169' 
  AND token = 'QiuuxrzSugvx8SmD1ElRK+d+hjhfRTmqi/zepYFtb4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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