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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b63e2a78e2ac522cedccd9284e88e57bb1b34413b702ceeca43c9b821e9704e' 
  AND token = 'YRSPeeS9Ni/PMd0VuWyS+0lvxh60Xcig4a3Xec71/8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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