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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076c47aa7973a4f3502b48607b6135d7f761cd3e92152a728c5c3bd1b8ee6adb' 
  AND token = 'Tbf2D/GXVh18G9MRy9HwNJ/xLRpZr9aN6Kk6lLXgKf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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