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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec3ac0faa4505c725e3d369cb91271cc0f1da27036e6cbb5c3ed9bc8da1657f' 
  AND token = 'tNX0Ul5W8LDp0qTcLLuKqjG/Xg5LeTofZrs+w4bj7PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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