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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418aaedc4bdec2ac28f3c4e4c636e3f587ab6412c85f1a4d29689aef2446a5b5' 
  AND token = 'Gv4FetTHhwXoxVPrfdjvPU4HTUwJ/Prsg9sMkQ/0zbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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